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65 - 270kW Class
Discharge air volume 10.5 - 49.3 m3/min(0.69MPa)
Ultimate high efficiency and energy saving thanks to Inverter equipped Two-stage Oil-free screw

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No matter what the load condition, Kobelco inverter control achieves ideal energy savings without unnecessary motor rotation. Instantly responding to any changes in demand pressure, pressure fluctuation could be minimized within ±0.01 MPa, thus supplying the required air volume with precisely controlled operating energy.


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Equipped with the world's first IPM motor

IPM motor achieves higher efficiency than either general-purpose induction motors or high-efficiency induction motors.

Specifically designed inverter couple with IPM motor can make a power-saving effect that no-conventional inverter can make.

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Capability for high pressure applications

Air cooled unit (0.88 MPa), water cooled unit (0.93 MPa)

Line pressure control (Optional)

The compressor can be controlled by detecting the pressure from the air line.

● Maintain a necessary pressure in the line
● The best energy saving operation is possible with an optimized discharging pressure
● Keep track of the pressure losses (losses in electric power consumption)


High performance screw unit

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A completely new design of the two-stage compressor unit and a reduction in package internal pressure losses resulted in an energy saving by 8% over existing models.Furthermore, a plate-fin, the first in the industry, was incorporated for the water-cooled, inter cooler and after cooler, reducing the air pressure loss to 1/5.


Ultimate clean air

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The oil-free design introduces absolutely no oil to the rotor chamber in the process. Stainless steel shaft-seal rings are used to prevent the generation of carbon dust, and KobelcoÕs patented twin atmospheric shaft vents prevent lubricating oil from contaminating the compression chamber even during extended periods of unloaded operations.



Improved maintainability

Extended overhaul schedules
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Recommended overhaul schedule for the 2nd stage was extended to every 6 years, whereas the 1st stage was extended to every 9 years (for an annual operation of 8,000 hours).
Annual maintenance involves changing the oil, oil filter element and exhaust cleaner only.
Frequency of capacity control operations
The life is extended to six times that of conventional models, with reliability and maintainability also improved.


Capability with 1.03 MPa specifications

All models are equipped with a compressor main unit that can operate with a pressure of up to 1.03 MPa.

alev ov10Improvement on durability for ambient

Alternate operation function of two units-Graph display of operating history, weekly timer, daily report management, maintenance information, and operation status.




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Built-in Higher harmonic reactor as standard

It reduces harmonics generated by the inverter.

* Complies with harmonic suppression guidelines by the Japan Electrical ManufacturerÕs Association (JEMA)
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Soft start by KOBELCO inverter

It reduces peak current when starting-up, thus ensuring smooth start-up and reducing power supply equipment cost.

Stable operations under various environments

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Totally enclosed fan-cooled motors are adopted to increase motor durability.

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Totally enclosed fan-cooled (TEFC) motor with enough capacity is selected to reduce the motor coil temperature and motor bearing temperature,leading significant improvement of reliability. Motor coil thermal detector is equipped for safety aspect.

Protection features

Various improved protection for Electric parts.

Momentary interruption protection: Within 0.5 sec.
alev ov15The compressor unit does not stop even when an momentary power failure (momentary power interruption, momentary power drop, temporary blackout) occurs, as long as the interruption time interval is less than the set value. The compressor unit is stopped when the power interruption duration exceeds the set value.

Built-in 12,000-V lightning surge killer and noise filter.

Automatic reset from power failure: 0.5 to 20 sec.
Example: Setting for recovery after power interruption: 5 sec.; power recovery standby time: 15 sec.


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Noise Reduction

Pulse noise is reduced by the perforated plate silencer, whereas the blade noise from the exhaust fan is reduced by optimum louver, thereby realizing top of its class low noise levels.

Exhaust cleaner that requires no oil mist breather piping

alev ov18Conventional countermeasure for oil mist is discharging the oil mist outside of package by using oil mist breather piping, which may cause the environmental problem. To avoid pollution,it was necessary to install filter on the end of piping or corona separation-type mist collector. Newly developed Exhaust Cleaner utilizes super fine filter which can be installed inside the compressor package, and no more breather piping is required.
This Exhaust Cleaner has its self oil separation and recovery function. This can prevent differential pressure increase and can realize long term maintenance interval.
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